Last updated: September 26, 2026
The cheapest South Korea eSIM in 2026 is Travelsim Asia at $2.99 for 1 GB / 7 days — but the cheapest option changes by plan size: Nomad wins 5 GB and Ubigi wins 10 GB. Travelsim Asia also leads at 3 GB ($6.99 / 15 days) and leads 20 GB ($23.99 / 30 days, $4 below the next cheapest), while Nomad's 5 GB at $10.00 and Ubigi's 10 GB at $14.00 take the middle of the range. This guide breaks down the cheapest option at every data tier — with exact prices, validity windows, and network coverage included.
Cheapest South Korea eSIM 2026 — quick verdict by plan size
- Cheapest 1 GB: Travelsim Asia — $2.99 / 7 days (Ubigi next at $3.00 / 7 days)
- Cheapest 3 GB: Travelsim Asia — $6.99 / 15 days (Ubigi next at $7.00 / 7 days)
- Cheapest 5 GB: Nomad — $10.00 / 30 days (Travelsim Asia is $11.99 here)
- Cheapest 10 GB: Ubigi — $14.00 / 30 days (Travelsim Asia next at $16.99)
- Cheapest 20 GB: Travelsim Asia — $23.99 / 30 days (Nomad next at $28.00)
- Lowest absolute per GB: Nomad 50 GB / 30 days — $0.78/GB ($39.00)
- Most expensive on short trips: Holafly — unlimited only, about $4/day on short stays (a 7-day plan is $27.50); FUP threshold not disclosed
Prices as of September 2026. Always confirm on provider websites before purchasing.
Cheapest South Korea eSIM by plan size (full breakdown)
Korea is unusual in that the cheapest provider changes with the plan size. We are cheapest at the small end and at 20 GB, and the middle of the range belongs to other people. Validity sits alongside price in the table below, because a plan that expires before your trip does is not cheap at any price.
| Data | Cheapest option | Price (USD) | Validity | Runner-up |
|---|---|---|---|---|
| 1 GB | Travelsim Asia | $2.99 | 7 days | Ubigi — $3.00 / 7d |
| 3 GB | Travelsim Asia | $6.99 | 15 days | Ubigi — $7.00 / 7d |
| 5 GB | Nomad | $10.00 | 30 days | Saily — $10.99 / 30d |
| 10 GB | Ubigi | $14.00 | 30 days | Travelsim Asia — $16.99 / 30d |
| 20 GB | Travelsim Asia | $23.99 | 30 days | Nomad — $28.00 / 30d |
All prices USD. Verified September 26th, 2026.
Cheapest South Korea eSIM for a 1-week trip
For a standard 7-day trip to South Korea with light-to-regular use — Naver Map, KakaoTalk, Papago translation, and some social media — 3 GB covers many travelers, and the cheapest 3 GB option with at least 7 days validity is Travelsim Asia at $6.99 for 15 days. If you lean heavily on maps and translation all day, the 5 GB tier is the safer pick — see the 2-week section below for that comparison.
| Provider | 3 GB price | Validity |
|---|---|---|
| Travelsim Asia | $6.99 | 15 days |
| Ubigi | $7.00 | 7 days |
| Nomad | $8.00 | 30 days |
| Airalo | $9.00 | 7 days |
| Saily | $8.99 | 30 days |
1-week verdict: Travelsim Asia's 3 GB plan at $6.99 is the cheapest option that comfortably covers a 7-day trip, with 15 days of validity headroom. Ubigi is a cent behind at $7.00, but only 7 days — fine if your trip is exactly a week, tight if it slips. Nomad's $8.00 / 30-day plan adds the broadest carrier set (all three Korean networks, including KT) and the longest window, so it's the pick if your dates are uncertain. Airalo's qualifying 3 GB plan is $9.00 for 7 days, the dearest here and with no headroom if your trip slips. They also sell a $8.00 version, but it expires in 3 days, so it is not really a week-long option.
Cheapest South Korea eSIM for a 2-week trip
Two weeks in South Korea with typical tourist usage — heavy Naver Map and Papago, daily KakaoTalk and social media — lands most travelers in the 5–10 GB range. The cheapest options:
| Provider | Plan | Price | Validity |
|---|---|---|---|
| Nomad | 5 GB | $10.00 | 30 days |
| Saily | 5 GB | $10.99 | 30 days |
| Travelsim Asia | 5 GB | $11.99 | 30 days |
| Ubigi | 10 GB | $14.00 | 30 days |
| Travelsim Asia | 10 GB | $16.99 | 30 days |
The honest answer on 5 GB and 10 GB: Nomad is the cheapest 5 GB plan at $10.00 / 30 days — Travelsim Asia is $11.99 here, so if 5 GB is exactly what you need, Nomad wins on price (and runs all three Korean carriers). At 10 GB, Ubigi is cheapest at $14.00 / 30 days, with Travelsim Asia next at $16.99. One validity trap to watch: Ubigi also sells a 10 GB plan for just $12.00, but that one is only 7 days — not enough for a two-week trip. The $14.00 version is the 30-day plan you actually want.
Cheapest South Korea eSIM per GB
Per-gigabyte value in Korea rewards buying more than most Korea trips use. The best rate here belongs to a 50 GB plan, and almost nobody spends 50 GB on a fortnight in Seoul and Busan. Read the table as a ceiling rather than a shopping list:
| Plan | Provider | Price | Price per GB | Validity |
|---|---|---|---|---|
| 50 GB | Nomad | $39.00 | $0.78/GB | 30 days |
| 25 GB | Ubigi | $25.00 | $1.00/GB | 30 days |
| 20 GB | Travelsim Asia | $23.99 | $1.20/GB | 30 days |
| 10 GB | Ubigi | $14.00 | $1.40/GB | 30 days |
| 20 GB | Nomad | $28.00 | $1.40/GB | 30 days |
| 10 GB | Travelsim Asia | $16.99 | $1.70/GB | 30 days |
| 5 GB | Nomad | $10.00 | $2.00/GB | 30 days |
| 3 GB | Travelsim Asia | $6.99 | $2.33/GB | 15 days |
| 5 GB | Travelsim Asia | $11.99 | $2.40/GB | 30 days |
| 1 GB | Travelsim Asia | $2.99 | $2.99/GB | 7 days |
Larger plans always cost less per GB. The jump from 5 GB to 20 GB roughly halves the per-GB rate.
Per-GB verdict: The lowest absolute per-GB rate in the Korea market is Nomad's 50 GB / 30-day plan at $0.78/GB ($39.00) — but that's only worth it if you genuinely need 50 GB. For the sizes that suit a normal Korea trip, the best value is Travelsim Asia's 20 GB at $1.20/GB ($23.99). Ubigi's 25 GB has the lower per-GB rate ($1.00), but the 20 GB is the cheapest mid-size plan outright and undercuts every provider's 10 GB plan per gigabyte. If you're buying mid-size data, the 20 GB plan is the smart move.
Why South Korea eSIM prices vary so much
The same 5 GB of data can cost anywhere from $10 to $12 in Korea, and a 20 GB plan ranges from $23.99 to $30.00. That spread comes down to a few market factors — not random pricing:
- Wholesale carrier access differs by provider. South Korea has three major networks — SK Telecom, LG U+, and KT. Some providers negotiate access to one or two of them; others (like Nomad) carry all three. Broader carrier access usually means a higher wholesale cost, which shows up in the retail price.
- Competition is concentrated at the popular sizes. The 5 GB and 10 GB tiers are where most travelers buy, so providers price aggressively there — that's why Nomad and Ubigi can undercut on the middle of the range. The very small (1 GB) and very large (20 GB) tiers see less competition, which is exactly where a focused operator can lead on price.
- Business model. Marketplaces and app-first brands carry app, account, and marketing overhead. A lean operator delivering by email with no app and no account has less cost to pass on — which is part of how Travelsim Asia keeps the 1 GB, 3 GB, and 20 GB plans the cheapest in the market.
Does cheapest mean worse network coverage?
Not in South Korea — and that's an important point. Unlike some markets, the cheap Korea options still run on major national networks. Here's who runs what:
The honest read on Korea coverage: the cheap options here are not running second-rate networks. Korea has three national carriers and the budget plans sit on the same ones the expensive plans use, so at this tier you can buy on price without giving up signal. Which provider runs on which carrier is set out in our South Korea buyer's guide.
Validity traps: when "cheap" isn't actually cheap
The most common mistakes when picking a South Korea eSIM on price alone:
- Airalo's 1 GB / 3-day plan. At $4.00 it already loses to Travelsim Asia's $2.99 — but the bigger catch is the 3-day window. If your trip is longer than 3 days, this plan expires before you head home. Travelsim Asia is $2.99 with 7-day validity, and Saily is $3.99 on 7 days.
- Ubigi's headline-cheap 10 GB. Ubigi advertises a 10 GB plan at $12.00 — but that's a 7-day window. For a two-week trip you'd need two of them, bringing the total to $24.00. The 30-day version is $14.00, which is the one that actually wins the 10 GB tier. Always check which Ubigi 10 GB you're buying.
- Airalo's short-validity small plans. Airalo's 3 GB / 3-day at $8.00 and 5 GB / 7-day at $10.00 look fine on the price tag, but the tight windows make them poor value for typical trip lengths. Compare the 30-day equivalents before buying — the cheap headline often comes with the shortest clock.
- Holafly — expensive for short trips. Holafly only sells unlimited, priced by duration. On short stays it works out to about $4/day (a 7-day plan is $27.50) — nearly three times what Travelsim Asia's 3 GB plan costs at $6.99 for the same week, with a FUP threshold Holafly doesn't disclose. The per-day rate drops on a 30-day plan (~$2.46/day, total $73.90), making it more competitive only at that length.
Cheapest South Korea eSIM with no app required
Korea has no IMEI registration requirement, so there is no paperwork between buying an eSIM and being online. That makes the app the only real friction left, and most providers still want one, plus an account, before they will activate anything. If you are landing at Incheon, Gimhae or Jeju with no data yet, that is a problem you have to solve before you can solve it. Travelsim Asia is the only provider in this comparison with neither: the eSIM arrives by email and installs from any browser.
For travelers who want the cheapest option that's also app-free: Travelsim Asia runs on SK Telecom and LG U+ — including SK Telecom, Korea's largest network — and has the lowest-priced 1 GB, 3 GB, and 20 GB South Korea eSIM plans, with no app and no account required. The 1 GB / $2.99 plan is the lowest 1 GB price in the Korea market and the only one requiring nothing more than your email to install.
Final verdict: which is the cheapest South Korea eSIM?
- Cheapest for short trips (1–3 GB): Travelsim Asia — $2.99 for 1 GB / 7 days and $6.99 for 3 GB / 15 days. Lowest prices at this tier with the best validity. Ubigi's 1 GB is next at $3.00, a penny behind us; Ubigi's 3 GB is also a cent behind at $7.00 but runs only 7 days.
- Cheapest 5 GB: Nomad — $10.00 / 30 days, the cheapest 5 GB in the market. Travelsim Asia is $11.99 here, so if 5 GB is exactly what you need, Nomad is the value pick — and it runs all three Korean carriers.
- Cheapest 10 GB: Ubigi — $14.00 / 30 days, clearly the cheapest 10 GB. Travelsim Asia is next at $16.99 (beating Nomad's $18.00, Saily's $18.99, and Airalo's $19.00), but Ubigi wins this tier outright. Watch the validity — Ubigi's $12.00 version is only 7 days.
- Cheapest 20 GB (and best mid-size value): Travelsim Asia — $23.99 / 30 days, and it's not close. The next cheapest 20 GB is Nomad at $28.00, then Saily at $29.99 and Airalo at $30.00 — Travelsim Asia is $4 below the next option. At $1.20/GB it undercuts every provider's 10 GB plan on a per-GB basis. For a longer trip or a heavier user, this is the strongest deal in the market.
- Watch out for: Holafly on short trips (unlimited only, about $4/day on short stays, undisclosed FUP). Airalo's 1 GB and 3 GB plans for trips longer than 3 days. Ubigi's $12.00 / 7-day 10 GB if your trip runs past a week. And remember the coverage point — the cheaper options here still run major Korean networks, so price and coverage don't trade off the way they do in some markets.
Dig deeper
More detail on the South Korea eSIM decision:
- South Korea eSIM Prices 2026 — full provider-by-provider price breakdown, including unlimited plans from Holafly, Nomad, Saily, and Ubigi.
- Best eSIM for South Korea (2026) — full comparison on coverage, throttling, setup, and value — not just price.
- Travelsim Asia vs Airalo South Korea eSIM — head-to-head on the two most popular options.
- How Much Data Do You Need for South Korea? — full breakdown by trip type, usage habits, and destination.
- How to Buy and Install a South Korea eSIM, step-by-step setup for iPhone and Android before you fly.
Not sure which plan is right for your trip? Our support team is available 24/7 via email and live chat — typical response time under one hour.